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Almen round An Almen round is a thin round disk used to quantify the intensity of a shot peening process. Developed in 1994 by Rudolf Bosshard in Switzerland, it is a modification of the Almen strip method which is a worldwide used surface treatment testing method〔David Kirk ("Peening Intensity Curves" ). (pdf) Summer 2007〕 in the field of shot peening. The basic principle is the same, but due to the simple shape and minimized size, the Almen round is more suitable for automated processing and installation on dummy rigs. Also instead of the Almen block according SAE J442,〔 Norm SAE J442 (March 2009). "Test Strip, Holder, and Gage for Shot Peening".〕 here a mathing device is used and if connected to electronic processing unit, the Almen value〔("Shot Peening Intensity" ) Retrieved 23 January 2013〕 according AMS-S-13165 (predecessor MIL-S-13165 Rev.C) can be evaluated in one run. == Test specimen ==
The Almen round is a circular cutting from an original Almen strip normally in material SAE 1070. It can be either of a "A", "C" or "N" type offered in various quality grades. The standard strip allows the splitting into four pieces rounds, which have a diameter of 18.7mm, by either waterjet or laser technic. Therefore, the spaces are maintained in respect of material and thickness. The flatness test to follow is simple and imprecise pieces can be eliminated.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Almen round」の詳細全文を読む
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